Static and interference eliminator



Feb. 13, 1934. ADAMS 1,946,606

STATIC AND INTERFERENCE ELIMINATOR Filed July 10, 1930 2 Sheets-Sheet 1 Feb. 13, 1934.

E. ADAMS 1,946,606 STATIC AND INTERFERENCE ELIMINATOR Filed July 10, 1930 2 Sheets-Sheet 2 4 a cl;

Patented Feb. 13, 1934 UNITED srATEs STATIC AND INTERFERENCE ELIMINATOR Ervin Adams, Mount Carmel, Pa, assignor of part interest to Remo Largioll, Roscoe D. Strawn, Wilson H. Ehret, Bela Bodner, Henry W. Brecker, and Martin J. Haney, all of Mount Carmel, Pa.

Application July 10, 1930. Serial No. 467,039

4 Claims.

While the drawings illustrate a preferred em bodiment of the invention, it is to be understood that in adapting the means to meet specific needs and requirements, the design may be varied and changes in the minor details of construction may be resorted to within the scope of the invention as claimed, without departing from the spirit thereof.

For a full understanding of the invention and the merits thereof, reference is to be had to the following description and the drawings hereto at-' tached, in which:

Figure 1 is a perspective view of a static and interference eliminator embodying the invention.

Figure 2 is an enlarged, central, longitudinal sectional view of the unit through which the current passes for operating the receiver.

Figure 3 is a similar sectional view of the unit 1 interposed in the aerial circuit.

Figure 4 is a transverse sectional view on the' line 44 of Figure 3.

Figure 5 is a sectional View on the line 5-5 of Figure 3.

Figure 6 is a cross sectional view on the line 6-6 of Figure 2.

Figure 7 is an enlarged detail sectional view of the ground connection.

Figure 8 is a diagrammatic view of the circuit.

Corresponding and like parts are referred to in the following description and designated in the several views of the drawings by like reference characters.

The device is mounted upon a base 1 and enclosed in a suitable case 2. The current circuit unit comprises a casing 3 which is closed at opposite ends and contains a core 4 which is cen trally disposed therein and supported in the ends of the casing. The core 4 consists of a stick of carbon. Crushed coke 5 or granulated carbon fills the upper half of the casing and sal ammoniac 6 fills the lower half of the casing. A metal plate '7 is disposed within the filling of crushed coke 5 or granular carbon. A metal rod 8 is disposed within the filling 6 of sal ammoniac and projects beyond the ends of the casing. Metal discs or plates 9 are strung upon the rod 8 and are maintained thereon in spaced relation. A metal plate 10 is interposed between the core 4 and tops of the discs or plates 9. a This plate 10 is preferably perforated. A plate 11 of mica or equivalent material is interposed between the perforated metal plate 10 and the core 4. The plates 10 and 11 extend between the ends and opposite sides of the casing 3. These plates 10 and 11 maintain a firm and positive contact between the core 4 and discs 9 and prevent noises resulting from loose connections.

The aerial circuit unit comprises a casing 12 similar to the casing 3. The casing 12 is closed at opposite ends in which ends are formed radial slots 13. A core 14 is located centrally within the casing 12 and supported in the ends thereof. Metal bars 15 are located in grooves or channels formed in the sides of the core 14. Metal combs 16 are associated with the respective metal bars 15 and are adjustable radially toward and away from the core 14. Lugs 17 project outwardly from the ends of the cones 16 and operate in the radial slots 13. Studs 18 project outwardly from the ends of the combs 16 and enter spiral slots 19 formed in plates 20 disposed against the inner sides of the ends of the casing 12. The plates 20 are of annular formation and connected for simultaneous movement to efiect uniform adjustment of the combs 16. A bar 21 connects the plate 20 and is provided at a central point with a post 22 which constitutes a finger piece. A circumferential slot 23 formed in the casing 12 receives the post 22. Rotary movement of the plates 20 effects radial adjustment of the combs 16 whereby they are moved toward or away from the respective bars 15 of the core 14. The combs 16 are maintained in determinate position and directed in their radial movement by the lugs 17 and slots 13, as will be readily appreciated.

The ground connection consists of a casing 4 and metal core therein. The casing 24 is perforated and is filled with crushed coke 25 or other granular carbon.

For compactness of arrangement, the units are disposed in parallel relation and are mounted upon strips 27 which are recessed in their upper edges to receive the respective units.

Referring to the diagram disclosed in Figure 8 of the drawings, the numeral 28 designates a radio receiver of any make or type adapted to be operated by battery or power generated current. The combs 16 of the aerial circuit unit are disposed in two series, one of which is included in the aerial circuit together with the core 14 and the other being grounded. The current circuit unit has the plate '7 grounded and included in the aerial circuit. The core 4 and the rod 8 are included in the positive and negative of the current circuit of the receiver. The elements 4 and 8 are connected to the positive and negative of the receiver whereas the core 14 and a set of combs 16 are connected to the aerial of the receiver while the other set of combs 16 are connected to the ground of the receiver. It has been found by experiment that a device constructed substantially as herein indicated materially clarifies radio reception and eliminates static and interference, paricularly in receivers which are operated by power generated current by being plugged into an outlet of a house current. The interference varies according to conditions and to allow for this variation, the combs 16 are mounted for adjustment. The combs l6 collect static and are adjustable to vary the distancebetween them and the core 14 according to the potential of the interference to be separated from the input. For filtering violent static the combs 16 are adjusted a greater distance from the core 14 than when the static is mild. The plate '7 is in circuit with the combs l6 and collects interference, due to fluctuations in the electric circuit, particularly when the latter is derived from a house current. This plate is grounded and admits of both static and interference passing off to ground.

A transformer 29 is located in the current circuit and provides compensating means for different voltages in power generated currents, particularly of the alternating type, whereby to adapt the eliminator to varying conditions of operating circuits and makes and types of receivers.

What is claimed is: r

1. An eliminator of the character specified comprising a core, static collecting comb members therearound, and means for adjusting said members radially toward and away from the core comprising rotary elements, and a stud and spiral slot connection between said members and rotary elements.

2.'An eliminator of the character specified comprising a core, comb members grouped about the core and adjustable radially, means for supporting and directing the members in their radial movement, and operating means for adjusting the said members consisting of rotary elements provided with spiral slots, and studs projecting from the members and operating in said spiral slots.

3. An eliminator of the character specified comprising a casing having radial slots in its ends, a carbon core mounted centrally within the casing, combs having terminal extensions operating in the radial slots formed in the ends of the casing, means for connecting the core and one of the combs in an antenna circuit, means for grounding another of the combs and means for adjusting the combs radially toward and away from the core, said means provided with corresponding spiral slots, and studs projecting from the endsof the combs and engaging the spiral slots.

4. An eliminator of the character specified comprising a carbon core, metal bars seated in the sides of said core, combs located opposite the respective metal bars, said combs being insulated from each other, means for adjusting the combs radially toward and away from the bars and varying the gaps between the combs and said bars, means for connecting the core andone of the combs in an antenna circuit, and means for grounding the other of the combs,said bars providing metallic conductors on the core cooperating with said combs.

ERVIN ADAMS. [L. S.] 

